To be worthwhile, the evolutionary investment in the human brain had to be substantial. Consider the mass of the brain and its need for strong, bony protection, and the fact that it uses 20 per cent of the body's metabolic energy. But intelligence coupled with communication by speech enabled us to harvest information and then refine it during arguments with our friends. Thus, for future generations, we stored the conclusions of our arguments in writing and pictures. Human culture and wisdom were made possible by speech. Complex speech patterns and writing make us unique amongst animals, but what was the cost? I think that communication by speech and writing, although at first it improved our chances of survival, has impaired our ability to think and delayed the emergence of a true Novacene. But how could speech, this great evolutionary gift, have been a disadvantage? Mainly, I think, by making linear thinking into a dogma, while allowing the power of intuition to be denigrated.